Twitter on Monday began testing "buy buttons" that let people make purchases directly from marketing posts fired off at the globally popular one-to-many messaging service. The move comes as Twitter works to ramp up its appeal to people curious about what is happening at any given moment and to advertisers eager to connect with them. "This is an early step in our building functionality into Twitter to make shopping from mobile devices convenient and easy, hopefully even fun," group product manager Tarun Jain said in an online post. The test was limited to a small group of Twitter users in the United States who access the service from mobile devices powered by Apple or Android software, according to Jain.



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